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  <title>Add value to field without carrying into more significant fields</title>
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  <div id="layout-content"><div id="intlcalendar.roll" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">IntlCalendar::roll</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.5.0, PHP 7, PHP 8, PECL &gt;= 3.0.0a1)</p><p class="refpurpose"><span class="refname">IntlCalendar::roll</span> &mdash; <span class="dc-title">Add value to field without carrying into more significant fields</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-intlcalendar.roll-description">
  <h3 class="title">说明</h3>
  <p class="para">
   面向对象风格
  </p>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>IntlCalendar::roll</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$field</code></span>, <span class="methodparam"><span class="type"><span class="type">int</span>|<span class="type">bool</span></span> <code class="parameter">$value</code></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   过程化风格
  </p>
  <div class="methodsynopsis dc-description"><span class="methodname"><strong>intlcal_roll</strong></span>(<span class="methodparam"><span class="type"><a href="class.intlcalendar.html" class="type IntlCalendar">IntlCalendar</a></span> <code class="parameter">$calendar</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$field</code></span>, <span class="methodparam"><span class="type"><span class="type">int</span>|<span class="type">bool</span></span> <code class="parameter">$value</code></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Adds a (signed) amount to a field. The difference with respect to
   <span class="function"><a href="intlcalendar.add.html" class="function">IntlCalendar::add()</a></span> is that when the field value
   overflows, it does not carry into more significant fields.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-intlcalendar.roll-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt>
<code class="parameter">calendar</code></dt>

    <dd>

     <p class="para"><span class="classname"><a href="class.intlcalendar.html" class="classname">IntlCalendar</a></span> 实例。</p>
    </dd>

   
   
    <dt>
<code class="parameter">field</code></dt>

    <dd>

     

<p class="para">
 One of the <span class="classname"><a href="class.intlcalendar.html" class="classname">IntlCalendar</a></span> date/time <a href="class.intlcalendar.html#intlcalendar.constants" class="link">field constants</a>. These are integer
 values between <code class="literal">0</code> and
 <strong><code>IntlCalendar::FIELD_COUNT</code></strong>.
</p>

    </dd>

   
   
    <dt>
<code class="parameter">value</code></dt>

    <dd>

     <p class="para">
      The (signed) amount to add to the field, <strong><code>true</code></strong> for rolling up (adding
      <code class="literal">1</code>), or <strong><code>false</code></strong> for rolling down (subtracting
      <code class="literal">1</code>).
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-intlcalendar.roll-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns <strong><code>true</code></strong> on success or <strong><code>false</code></strong> on failure.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-intlcalendar.roll-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2414">
   <p><strong>示例 #1 <span class="function"><strong>IntlCalendar::roll()</strong></span></strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />ini_set</span><span style="color: #007700">(</span><span style="color: #DD0000">'date.timezone'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'Europe/Lisbon'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ini_set</span><span style="color: #007700">(</span><span style="color: #DD0000">'intl.default_locale'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'pt_PT'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$cal&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">IntlGregorianCalendar</span><span style="color: #007700">(</span><span style="color: #0000BB">2013</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5&nbsp;</span><span style="color: #FF8000">/*&nbsp;June&nbsp;*/</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">30</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$cal</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">add</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlCalendar</span><span style="color: #007700">::</span><span style="color: #0000BB">FIELD_DAY_OF_MONTH</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlDateFormatter</span><span style="color: #007700">::</span><span style="color: #0000BB">formatObject</span><span style="color: #007700">(</span><span style="color: #0000BB">$cal</span><span style="color: #007700">));&nbsp;</span><span style="color: #FF8000">//&nbsp;"01/07/2013,&nbsp;00:00:00"<br /><br /></span><span style="color: #0000BB">$cal</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">set</span><span style="color: #007700">(</span><span style="color: #0000BB">2013</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5&nbsp;</span><span style="color: #FF8000">/*&nbsp;June&nbsp;*/</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">30</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$cal</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">roll</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlCalendar</span><span style="color: #007700">::</span><span style="color: #0000BB">FIELD_DAY_OF_MONTH</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">true</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;roll&nbsp;up,&nbsp;same&nbsp;as&nbsp;rolling&nbsp;+1<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlDateFormatter</span><span style="color: #007700">::</span><span style="color: #0000BB">formatObject</span><span style="color: #007700">(</span><span style="color: #0000BB">$cal</span><span style="color: #007700">));&nbsp;</span><span style="color: #FF8000">//&nbsp;"01/06/2013,&nbsp;00:00:00"</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
string(20) &quot;01/07/2013, 00:00:00&quot;
string(20) &quot;01/06/2013, 00:00:00&quot;
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-intlcalendar.roll-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="intlcalendar.add.html" class="methodname" rel="rdfs-seeAlso">IntlCalendar::add()</a> - Add a (signed) amount of time to a field</span></li>
    <li class="member"><span class="methodname"><a href="intlcalendar.set.html" class="methodname" rel="rdfs-seeAlso">IntlCalendar::set()</a> - Set a time field or several common fields at once</span></li>
   </ul>
  </p>
 </div>


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